Gas burner



Jan. 26,1926. 1,570,683

M. M. KOHN GAS BURNER Filed June 20, 1923 2 Sheets-Sheet 1 IN V EN TOR zwizz/ W ATT NE?" Jan. 26 1926. 1,570,683

M. M. KOHN GAS BURNER Filed Jun; 20, 1923 2 Sheds-Sheet 2 BY ATTORNEY Patented Jan. 26, 1926.

FFUNITUED STAT-ES PATENT OFFICE."-

MILTON, onn, ornnw YORK; Y,

GAS" BURNER.

Application filed .Tune 20, 1923. Serial Nb. 646,6}05.

Tooll whom it may" concern:

Be itltnown that I, MILTON" M. KoHN, a citizen-f the United. States, residing in New York, in the countyof New York and State of New York, have invented certain new and 'usetul.Improvements in Gas-Burners, of which the following isa specification.

This invention-relates to burners and appliances used in connection tl1erewitl1,-the same being a continuation in part of my application for patent, filed June 19', 1922, Serial No. 569,346, andhas as one of its several objects to provide a type of burner in which the air, under pressureor not, and gas are separatelyand'accurately controlled and delivered to'the mixing chamber under the impetus of a device operating on the principle of an inject-or, securing unusually effective-results.

A further purpose is to produce a burner having a relatively large base efiiciently supported at a spaceddistance'from the surface on whic-lrit' rests, the base being formed with openings tending to minimize heat from radiating downwardly to the detri-- ment of the surroundings v -Another arm 1s 1n the provision ofa spider suited to= engage and centrally supa heat. retainerv used in connection.

port

still further object is to provide means i forcommunicating a current of compressed air to'fthe burner from any convenient source,"'for augmenting its heating effect, and 'also' meansifor controlling the size of the gas orifices through the air connections and mixing chamber.

Stillanotherpurpose is to provide means Figure 3 is a fragmentary partial side,

partial sectional view of a modification in means for. attach1ng the spider to the tube.

in the same Figure 4 is a view" similar tdF1g-J 'Shbw?v ing another modification." Figure 5 is a partial side elevationalview of a further chai'ige'in constructionf v E Figure '6 is a partial si'dejpartial sectional View showing a modi fiediform of burner H inlet. v Figure 7 is an end View of the air inlet cone looking as indicated by line 7-7 of Fig. 1. i

Figure disc shutter.

Figure 9 is a the gas inlet nipple, 'showingj meansbf.ad'-' usting size of open ng.

taken on line 10 -"101 of Figi'9. I v Figure 11 is afr'agmentary side'view showing another type ofjoint at the junction ofthe inlet and mixingchajmberffl Figure 12). further modification of the cone construction.

Figure 13 is a longitudinal sectional view of a modified form of gas inl'et nipple,- to adjust gas supplied according to" use of burner as a plain Bunsen or as a pressure or blast burner. a Figure 14 is a 'tran'sverse sectional view taken on line 14:44 or Fig. 13.

Stated in general termsftheinvention consists in an -appliance particularly design'ed and adapted'for laboratorieswhere' small quantities of material are to be brought to a high degree of heatin a rapid 8 is a sectional view through the F'gure 10 is a transverse sectionalview fragmentary side view of is a similar view showing a and unifornrmanner' and under perfect control, as in melting small quantities of rare metals: by the use of a blast flame produced device, and for such purposes as casting dentures, dental inlays, bridges,

etc., in highly heated moulds or investments individually formed to suit special 'requirements, and for heat treatments of metals, chemical work, etc.

The results attained from an atmospheric gas or Bunsen burner depend on two "factors, one,'the gas, whether rich or, lean, that is to sayits carbon content, depending on the source from which it ,is' derived,

asfnatural or illuminating gas artificially made from coal, oil, etc., together with the, a

pressure at which it supplied.

The other factor isthe air, e1 ma-l atmOSphQIlC pressure or under compres- :sion, and if under-normal conditions therefthe at ne feet of the air varies in accordance with the humidity of the atmosphere and also the temperature.

It is thus highly essential that efficient and convenient control of the gas and air inlet-s be provided.

The invention comprises a burner having a base, generally designated in the drawings by the numeral 25, the same being essentially circular in outline and sup-ported at a suitable height from the surface of a bench, table or the like by integral feet 26 extending from the edges of the base at uniform intervals, three of these feet being shown.

The upper surface of the base is raised by concentric steps 28 and 29 towards its central portion 30 which is provided with a lateral extension 31, smooth bored to receive the mixing tube 32.

The central, uppermost part 30 of the base is suited to receive the vertical burner tube 33, communicating with the mixing tube 32. and a plurality of openings 34 are formed through the base to allow free passage of til, the openings also tending to prevent ,onduction and radiation of heat from the qurner.

Entering into the outer end of the mixing tube 32, in the manner of a slip joint, is a hollow stem 35 formed at the smaller end of a hollow cone 36, provided at its expanded outer end with a partial closure containing openings, and fitted to tightly engage a hollow screw stud or nipple at its center.

Said nipple extends from a gas valve body 41, provided with a controlling handle 42 and having an oppositely extending corrugated sleeve 43 adapted to receive a common flexible gas hose (not shown) leading from any convenient source of supply.

Fitted to rotate on the nipple 40 is a disc 44 having a knurled periphery for convenience in handling, the disc act-itng as a shutter or valve with respect to the openings 38 and controlling the inlet of air o the cone in an efficient manner.

As shown in Fig. 11. the outer end of the tube 32 is formed with an open slot 45 turned at an angle at its inner end and a pin 46 is fixed in the side of the entering tube 35', the tube engaging in the slot in the manner of the well known bayonet joint, locking the cone positively to the mixing tube. V

Figure 12 shows a connecting means in which the tube 35 is formed with interrupted or slotted screw threads 47 and the inner end of the mixing tube is provided with corresponding threads 48, said screw thread constituting a secure fastening device of the rapid transit order. 7

The preferred form, that is'the plain slip tube shown best in Fig. 2, is however the least expensive to construct and has the advantage of permitting the air inlet cone and gas valve to be rotated into' any preferred position as well as removed or applied in the shortest possible time, it being understood that the stem 35 may be slightly bevelled on its end to effect an easy entrance into the tube 32.

As illustrated in Fig. 6, the air inlet cone has adjacent its enlarged end, a plurality of inwardly extending webs 52, either straight or spiral to assist in thoroughly mixing the air and gas before ignition, and the inner surfaces 53 of the webs are screw threaded to match with the threads on the gas inlet nipple 40.

This nipple 40 is formed at one end with a preferably tapered end closure 55 having a central gas outlet passage 56 restricted by means of a screw 57 adjustably mounted in the web or spider 58 formed in the nipple adjacent the tapered end closure 55, and said screw head 57 materially assists in the more thorough mixing of the gas and air mixture, by causing said mixture to impinge and break on said screw head.

A stop cook 41 is threaded on the nipple 40 at the end opposite the tapered end closure and is provided with the usual corrugated tubular extension 43 over which the custoi'nary gas hose is fitted.

Rotatably mounted on'the nipple 40, intermediate the air inlet cone 50 and stop cock 41, is a disk 44 and formed centrally of the disk is a threaded opening which matches with the threads on the nipple 40 so that rotation of the disk will cause the same to move into various adjusted positions longitudinally of the nipple whereby the inlet of air to the cone 36 may be varied to meet varying conditions.

Formed integrally with the disk 44 is an angularly extending nipple 63 provided with an enlargement 64 for retaining a flexible air inlet tube in place, the nipple 63 having an internal passage 65 communicating with an opening 66 in the disk.

An enlarged internally threaded bore 67 extends into the outer end of the nipple 63 in axial alinen'ient with the opening bore 65 for the reception of a screw plug 68 which is placed in position when the air inlet tube previously described is not employed.

In use, it will be seen that as air enters the cone 36, and encounters the spiral webs 52. it will obviously be given a whirling motion and tho-rough mixing of the air and gas is thereby assured. hen it is desired to increase the flame and heating efficiency of the burner, the screw 68 is renlovetl and an air tube connected to the nipple 63 so that pressure conveyed through the tube will pass through the nipple and opening 66. 7

It is to be understood that prior to connecting the air tube. the disk is rotated to i be brought up tightly against the enlarged end of the cone 36 so as to prevent the escape of the air or gas.

In Fig. 13 a modified type of gas inlet is shown in which the gas stop cook 41, at the end opposite the inlet 43, is suited to receive a nipple 4C0 screw thread-ed through-- out its length on its exterior in a manner similar to the nipple 40, to engage a control disc 71 of the same type as the disc 44.

A disc 72 is held in the opening leading to the passage through the cock by the threaded nipple 40, its end abutting the disc, which was an eccentrically positioned opening 7 3 leading to the passage through the cock.

Rotatably mounted in the nipple 4:0 is a cylindrical plug 7 1 having two longitudinal passages 7 5 and 76, the former being of the same area as the opening 7 3 and the latter of much lesser area, either being axially registerable with the opening 7 3.

A knobbed stem 77 fixed in the plug 'Ttv extends through a recess 7 8 formed in the nipple 40, the recess being proportioned to permit the plug to be turned to bring either of the passages 7 5 or 7 6 into register with the opening 73 as may be desired, thus providing adjustable and selective means for positively controlling the flow of gas through the nipple.

From the foregoing it will be seen that the same burner may be used in the ordinary manner as a Bunsen, or as a blast burner by the use of compressed air, the air device being arranged either as a part of the original burner or as a separate attachment to be used in place of the ordinary burner inlet.

"While certain preferred embodiments of this device have been shown and described, it will be understood that changes in the form, arrangements, proportions, sizes and details thereof may be made without departing from the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a gas burner having an inlet tube, a hollow cone removably secured in said tube, a. hollow screw supplying gas to said tube, means in ,said screw for controlling the passage therethrough, means for entering air therein, and a plurality of helical vanes integral in said cone for causing the entering air to assume a whirling motion prior to commingling with the gas.

2. In a gas burner comprising a b o dy having an inlet, a hollow cone removably secured in said inlet, a series of helical webs formed in the larger end of said cone, independe t means for enteri g gas and air a hollow mixing cone removably secured in said inlet tube, a series of helical webs in the larger end of said cone, a damper controlling the inlet 01" air to said cone, anipple on said damper for attaching a source of compressed air, a valve controlling the passage of gas to said inlet tube, and means for limiting the entry of gas irrespective of said valve.

4. In a gas burner havingan inlet, a hollow cone removably secured in said inlet, a. hollow screw extending into said cone, said screw being in communication witha gas supply and having an opening in its point, means for controlling the passage of gas from said supply, and means for adjustably restricting the opening in the point of said screw.

5. In a gas burner having an inlet, a hollow cone entering said inlet, deflecting vanes in the base of said cone, an adjustable air inlet for said cone, a conically pointed hollow screw entering said cone, adjustable means for controlling the passage in the point of said screw, a gas cock associated with said screw, and means on said screw controlling the entrance of atmospheric air to .said cone.

6. In a gas burner having an inlet, a hollow cone removably engaged in said inlet,

a hollow screw threaded into the base of said cone, a gas cook fixed on the outer end of said screw, and means in said screw to control the passage therethrough.

7. In a gas burner having an inlet, a hollow cone removably engaged in said inlet, a. hollow screw threaded into the base of said cone, a gas cock fixed on the outer end of said screw, means within the screw for adjustably controlling the passage therein, and means on the screw for controlling the inlet of .air to said cone.

8. In a gas burner having an inlet, a hollow cone removably engaged in said inlet, a hollow screw threaded into the base of said c one, a gas cock fixed on the outer end of said screw, a disc having an offset perforation fixed in said cock at the end of said screw, a plug in said screw, said plug having two longitudinal passages of unequal area, and means for rotating said plug to bring either of the passages into registration.

In testimony whereof I have signed my name to this application.

MILTON KOHN, 

